<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>
<body>
    <div id="app">
        <h1>{{msg}}</h1>
    </div>
    <script>
        const vm = new Vue({
            // el:'#app',
            data(){
                return {
                    msg:'今天又是元气满满的一天啊！'
                }
            }
        })
       setTimeout(()=>{
        vm.$mount('#app')
       },5000)
        // 将vm的挂载单独写出来的优点：可以自由选择挂载时间
    </script>
</body>
</html>